QThreadPool has a dead lock in destructor if instantiated as global

#include <QThreadPool>

Q_GLOBAL_STATIC(QThreadPool, global_pool)

class SleepRunable : public QRunnable {
public:
    SleepRunable() {
        setAutoDelete(true);
    }

    void run() {
        QThread::msleep(100);
    }
};

void startTask(QThreadPool* pool) {
    pool->setMaxThreadCount(1);
    pool->start(new SleepRunable());
}

void good1() {
    QThreadPool pool;
    startTask(&pool);
}


void good2() {
    startTask(global_pool);
    global_pool->waitForDone();
}

void bad() {
    startTask(global_pool);
    // infinity wait in global_pool->dtor
}

int main(int argc, char *argv[])
{
    //good1();
    //good2();
    bad();
}

if (msecs < 0) {
        while (!(queue.isEmpty() && activeThreads == 0))
            noActiveThreads.wait(locker.mutex());
    } else {

    QThreadPool *globalThreadPool = 0;
    QT_TRY {
        globalThreadPool = QThreadPool::globalInstance();
    } QT_CATCH (...) {
        // swallow the exception, since destructors shouldn't throw
    }
    if (globalThreadPool)
        globalThreadPool->waitForDone();